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Magnetic excitations and electronic structure of Kagome metal FeGe

ORAL

Abstract

Two-dimensional (2D) layered Kagome compounds are great platforms to study not only magnetic frustration but also topological phases that realize flat bands. It is predicted that the Kagome lattice can be constructed to realize flat band physics at 1/3 filling and quantum anomalous Hall effect mainly at 2/3 filling. Recently, a family of Kagome metals TmXn (T: Fe, Co, X: Sn,Ge, m:n = 3:1, 3:2, 1:1) has attracted much interests. Although flat bands and Dirac crossings are expected in the single-orbital nearest-neighbor Kagome model, possible complications from evolution of the magnetic order and strong electron-electron interactions remain largely unexplored experimentally. Here I will present a new Kagome system - FeGe. Distinct from widely studied planar antiferromagnetic (AFM) FeSn (TN = 365 K) and paramagnetic CoSn, it has a collinear c-axis antiferromagnetic (AFM) structure between T­­N = 410 K and T1 ~ 60 K, followed by an AFM spiral structure below T1 ~ 60 K.

In this talk, I will focus on systematic studies of the magnetic excitations and electronic structures via neutron scattering and angle-resolved photoemission spectroscopy measurements, which reveal this system to be an exciting new platform for studying correlation and magnetism in the presence of topology.

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Presenters

  • Xiaokun Teng

    Rice University

Authors

  • Xiaokun Teng

    Rice University

  • Ji Seop Oh

    Rice University, University of California Berkeley, University of California Berkeley

  • Ming Yi

    Rice University, Rice Univ

  • Pengcheng Dai

    Rice Univ, Rice University

  • Jianxin Zhu

    Los Alamos Natl Lab, Los Alamos National Laboratory

  • Kelly Neubauer

    Rice Univ

  • Lebing Chen

    Rice University

  • Bin Gao

    Rice University

  • Feng Ye

    Oak Ridge National Laboratory, Oak Ridge National Lab

  • Garrett E Granroth

    Oak Ridge National Laboratory, Oak Ridge National Lab

  • Aaron Bostwick

    Lawrence Berkeley National Laboratory, Lawrence Berkeley National Lab, E. O. Lawrence Berkeley National Laboratory, lawrence berkeley lab, Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley

  • Eli Rotenberg

    Lawrence Berkeley National Laboratory

  • Christopher Jozwiak

    Lawrence Berkeley National Laboratory, Lawrence Berkeley National Lab, E. O. Lawrence Berkeley National Laboratory, lawrence berkeley lab, Advanced Light Source, Lawrence Berkeley National Laboratory

  • Makoto Hashimoto

    SLAC National Accelerator Laboratory, SLAC - Natl Accelerator Lab, SLAC National Accelerator Lab

  • Donghui Lu

    SLAC - Natl Accelerator Lab, SLAC National Accelerator Laboratory, SLAC National Accelerator Lab

  • Robert J Birgeneau

    University of California, Berkeley